Buttonhole-feeding mechanism.



E. C. GERSTENBERGER.

Patented June 19, 1917.

2 SHEETS-SHEET I.

BUTTONHOLE FEEDING MECHANISM.

APPLICATION FlLED DEC. 7

WITNESSES %r JW Ar E. C. GERSTENBERGER.

BUTTONHOLE FEEDING MECHANISM.

APPLICATION FILED DEC Patented June 19, 1917'.

2 snsns suazr 2.

INVENTOR ATTORNEYS WITNESSES T FICE- EDWARD C. GERSTENBERGER, OF BROOKLYN, NEW YORK.

BUTTONHOLE-FEEDING MECHANISM.

Specification of Letters Patent.

Patented J une 19, 191'7.

Application filed December 7, 1916. Serial No. 135,574.

To all whom it may concern:

Be it known that I, EDWARD C. GERSTEN- BERGER, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Buttonhole Feeding Mechanism,

of which the following is a full, clear, and

exact description.

The invention relates to buttonhole sewing machines, and its object is to providea new and improved feed mechanism arranged to insure a positive gripping or braking of the feed wheel in a very simple and inexpensive manner.

In order to accomplish the desired result, use is made of a gripping or brake block extending loosely into a groove in the feed wheel and resting on the bed plate or otherings forming a part of this specification, in.

which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a perspective view of a buttonhole sewing machine provided with the improved feed mechanism;

Fig. 2 is an enlarged cross section of the feed mechanism as applied, the stitch-forming mechanism being omitted, the section being on the line 22 of Fig. 3;

Fig. 3 is a sectional plan view of the same; and

Fig. 4 is an enlarged cross section of the bed plate, part of the feed wheel and the gripping or brake block provided with the pendulum.

In buttonhole sewing machines as now generally constructed, use is made of one or more brake dogs which work in a groove of the intermittently rotating feed wheel to prevent recoil or backward motion of the feed wheel at the end of the forward feeding movement thereof. The dog used quickly wears at its impinging end and quickly be comes unreliable. In order to overcome this defect use is made of the improvement presently described in detail.

The buttonhole sewing machine is mounted on a bed plate 10 and is provided with the usual stitch-forming mechanism 11, the work clamp '12 and the feed wheel 13 engaged by the feed lever 14 connected with the shipper lever 15 actuated by the driving lever 16 controlled by a-cam 17 driven from the shaft 18 of the sewing machine. Ihe feed lever 14: is provided with the usual feed block 19 working in the feed groove 20 formed in the underside of the feed wheel 13 so that when the machine is running the desired intermittent rotary motion is given to the feed wheel 13, and the feed lever 14 is always returned by the action of its spring 21.

Into the feed wheel groove 20 at the rear of the machine extends loosely a gripping or a brake block 25 restingon the bed plate 10 and having a depending rod 26 extending loosely through an aperture 27 formed in the bed plate 10, as plainly indicated in Figs. 2 and 4. On the lower end of the rod 26 is adjustably secured a weight 28 by the use of nuts 29 and 30 screwing on the lower threaded portion 31 of the rod 26. The latter and the weight 28 form a pendulum for the gripping or brake block 25 to rock the latter in a transverse direction with a view to engage the front and back of the block 25 with the walls of the feed wheel groove 20 with a view to brake and stop the feed wheel at the end of its rotating period to prevent rebounding or backward movement of the feed wheel. This rocking movement given to the gripping or brake block 25 by the pendulum is due to the vibration induced on running the machine, especially during the working of the stitch-forming mechanism. The gripping or brake block 25 is located at the rear of the machine, as at this point the vibrations in a transverse direction are more noticeable, to insure a firm impinging of the gripping or brake block on the walls of the feed wheel groove 20 and the face of the bed plate 10. His under- 1 stood that at the end of the feeding period of the feed wheel 13 the latter is held against return or rebounding movement owing to the gripping or brake block 25 impinging on the walls of the feed groove 20 and the face of the bed plate 10 (see dotted line positions, Fig. 4). It is further understood that the gripping or brake block 25 at its forward oscillation impinges with its front lower edge on the front wall of the groove 20, the upper front edge impinges on the top wall or roof of the groove 20, the rear upper edge impinges on the rear wall of the groove 20 and the rearlower edge impinges 0n the bed plate 10. In a like manner the gripping or brake block'25 at its rear oscillation impinges with the front lower edge the bed plate 10, with the front upper edge the front wallof the groove 20, with the rear lower edge the rear wall of the groove 20, and with the rear upper edge. the roof of the groove 20. Thus four lines-of contact are had at" each oscillation of the gripping or brake block to insurepositive holding of the feed wheel against return or rebounding movement. During the feeding period the resistance of the gripping or brake block 25 is overcome by the pulling action of the block 19.

The feed mechanism, shown-and described can be readily applied to buttonhole sewing machines as'now generally constructed, it

being. only necessary to removethe usual dog or dogs and place the gripping or brake block in position as above described and shown in the drawings. For lower or higher speeds it is necessary to, adjust the weight 28 farther down or fartherup on therodi 26 to render the. action of; the gripping or brake block 25, correspondingly sensitive. Thus for low speeds the weight28 is moved farther down on the rod 26 and for high speeds the weight 28 is. adjusted. in an upward direction on the rod. 26.

Having thus described: my invention, I cla m as. new and desire to secure by Letters,

Patent 1. In a, feed mechanism for buttonhole sewing machines, a feedwheel; having a feed groove in its lower face, a freely supported gripping block extending loosely into the groove of the feed wheel, and a pendulum depending fromthe said, block and adapted to rock the latter to. engage the gripping block with the walls of the feed wheel groove.

2.'In 'a feed mechanism for buttonhole sewing machines, a bed plate, a stitch-forming mechanism and a feed mechanism having an intermittently rotating feed wheel provided with a feed groove, and a block resting on the said bed plate and extending loosely in the said groove, the block having a depending rod provided with a weight at its lower end.

3. In a feed mechanism for buttonhole sewing machines, a bed plate, a stitch-forming mechanism and a feed mechanism having an intermittently rotating feed wheel providedwith a feed groove, a block resting on the said bed plate and extending loosely in the said groove, the block having a depending rod, and the said bed plate having aning rod and the said bed plate having an aperture at the rear through which extends,

loosely the said rod, a weight held adjustable onthe lower end of the said rod, andmeans to lock the weight in the adjusted position on the rod.

5. In a feed mechanism for buttonhole sewing machines, a feedwheel having a feed,v

groove in its lower face, a freely supported gripping block extending loosely into the groove of the feedwheel, arod depending from the said block and a weight adj ustably secured on. the lower end ofthe said rod to form a pendulum for the block.

EDWARD G. GERST-ENBERGER;

Copies. of this, patent may. be obtained for fi ve cents each, by addressing the Commissioner, of Patents, Washington, D. G. a 

